# What is the test of divisibility of 18?

A number that is divisible by 18 must be divisible by both 2 and 9.

The inverse is also true: A number that is divisible by both 2 and 9 must be divisible by 18.

Therefore, we just have to test for both divisibility by 2 and 9.

If a number passes both tests, then it will surely be divisible by 18.

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Test of divisibility of

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A number is divisible by 18 if it is divisible by both 2 and 9. To check divisibility by 2, examine if the number is even (ends in 0, 2, 4, 6, or 8). To check divisibility by 9, find the sum of the digits of the number. If the sum is divisible by 9, then the number itself is divisible by 9. Therefore, to determine if a number is divisible by 18, it must meet both conditions: it should be even and the sum of its digits should be divisible by 9.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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